Dynamo-electric machine and brush-holder device therefor



C. GILCHRIST. DYNAMO ELECTRIC MACHINE AND BRUSH HOLDER DEVICE THEREFOR.

APPLICATION FILED JULY 9, 1917. 1

Patented Apr. 19, 1921.

"IIIIIII! I 71 I I jIII UNITED STATES.

CLARENCE F. GILCHRIST, 0F TOLEDO, OHIO, ASSIGNOR TO WILLYS CORPORATION, OF

TOLEDO, OHIO, A CORPORATION OF DELAWARE.

PATENT OFFICE.

DYNAMO-ELECTRIC MACHINE AND BRUSH-HOLDER DEVICE THEREFOR.

Specification of Letters Patent. Patented Apr, 19, 1921 Application filed. July 9, 1917. Serial No. 179,462.

To all whom it may concern Be it known that I, CLARENCE F. GIL- CHRIST, a citizen of the United States, residing at Toledo, in the county of Lucas and State of Ohio, have invented certain new and useful Improvements in DynamoElectric Machines and Brush-Holder Devices Therefor, of which I declare the following to be a full, clear, and exact description.

This invention relates to improvements in dynamo-electric machines, and more particularly to improvements in brush holder devices therefor.

The principal object of this invention is to provide an improved brush holder mounting, simple and compact in construction, and which permits the ready assembly and easy adjustment of the brush holder brackets relative to the casing. A further object of my invention is to provide a brush holder mounting such that one of the brush holders can be adjusted relative to the other and also such that the entire brush holder ring may be adjusted relative to the casing. further object of my invention is to provide improved means for insulating a brush holder from the ring by which it is sup- I ing specification.

ported.

Further objects, and objects relating to economics of manufacture and details of construction, will definitely appear from the detailed description to follow.

I accomplish the'objects of my invention according to one embodiment thereof by the devices and means described in the follow- 'A structure constituting a preferred embodiment of my invention is illustrated in the accompanying drawing, forming a part of this specification, in which,

Figure I is a vertical sect onal V ew through a dynamo-electric machine-casing, taken on the line I-I of Fig. II, and showing the brush assembly in rear elevation.

Fig. II is a vertical sectional View taken substantially on the line-IIII of F1g. I.

Fig. III is a detail, sectional view, taken substantially on the line III-'-III of Fig. I.

Fig. IV is a fragmentary detail, sectional View, ken substantially on the lin 117; ;v of Fig. I.

Fig. V is a View of the 'brush holderrin F ig. VI is a fragmentary View of one of the insulating rings or washers, and

Fig. VII is an enlarged, detail, fragmentary, sectional view, taken substantially on the line VII-VII, of Fig. I.

In the drawings, similar reference numerals refer to similar parts throughout the several views, and the sectional views are taken looking in the direction of the arrows at the ends of the section lines.

. The casing or commutator housing 10 has an end wall 11 from which a cup 12 in this embodiment of the invention is struck out ax ally thereof, a ring 13 being disposed in said cup and adapted to receive a bearing for the armature shaft, which is not shown. The brush holder ring 14 is provided with a central cup shaped portion 15, which is struck out axially thereof and has an inwardly directed flange 16, the inner edge of which engages the-edge of the ring 13 when the brush holder ring is secured in place in the casing. The brush holder. ring is provided with diametrically opposite ears 17, which are struck back from the body of the ring, so that said ears lie in the plane of the flange 16, and said ears are provided with the elongated slots 18, through which the bolts 19 pass, by means of which the brush holder ring may be adjustably secured to the end wall 11 of the housing.

Rings or washers 20, which are made of suitable insulating material, are provided, one of said washers being secured on each side 'of the body portion of the ring 14; and

24 and a slot 25, which openings and slot is are disposed in positions corresponding to the openings 22 and the slot 23 of the ring 14, but the dimensions of the openings and the slots in the washers 20 are slightly less than the dimensions of the corresponding openings and slot in the ring 14. That 1s to say, the diameter of the openings 24 1s slightly less than that of the openings 22, and the width'and length of the slot 25 is slightly less than that of \the slot 23, so

' and 25 in the washers 20 and the ring that, when the washers are secured in place relative to the ring 14, the insulating material will project slightl around the openings in the ring, as shown in Fig. VII, so as to hold the bolt passing through said opening away from the metal of the ring to insulate it therefrom.

The brush holder brackets 26 are mounted on the ring 14, being insulated therefrom by the outer washer 20, and each of said brackets domprises the U-shaped channel sulating washers and the ring respectively,-

while the third brush 28 and holder bracket 27 are secured to the ring by the bolts 29 and 30, which pass through the slots 23 It will be seen that the third brush is adjustable relative to-the brush holder ring.

At one end of the bracket 26, there are provided the upstanding ears 31 and 32 respectively, the ear 31 being staggered slightly relative to the ear 32, as shown in Fig. IV, and the end 33 of a coiled spring 34 is fastened between said ears, the end of said spring 34 extending laterally and engaging the outer end of the brush at 35 to yieldingly .hold the brush in engagement with the commutator.

The brushes 28 are shown connected by wires 36 to clips 39 which are secured to the end wall 11 by terminal bolts 40 and these clips 39 are also, shown connected by wires 38 to clips 37 secured to the brush holders by bolts 30. Electrical connection is made to the third brush 28' by the wire 36'.

From the description of the parts given above, the operation of this device should be very readily understood. The brush holders are all mounted on the ring 14, which maybe adjustably secured to the end wall of the casing, by means of the bolts 19, which pass through the slots 18 in the ears 17 of the brush holder ring, so that the 2 brush holders can be adjusted relative to the casing in a group. The third brush holder is also adjustable independently of the other two, and relative thereto, by means of the slot 23, in which the bolts 29' and 30 are disposed. The brush holder brackets are mounted on the ring 14:, and insulated therefrom by means of the washers 20, and, since the washers have smaller openings than the openings in the ring, the bolts passing through said openings are insulated from the metal of the ring by means of the scribed, is susceptible of considerable varia-.

tion without departing from the spirit of my invention, but I have found that this particular embodiment is desirable from many standpoints, and, therefore, I desire to claim my invention both specifically and broadly as indicated by the appended claims.

Having thus described my invention, what I claim as new and desire to. secure by Letters Patent is: V

1. In a dynamo-electric machine, the combination of a casing, having an end wall with a cup struck out axially therefrom; a ring disposed in said cup with its inner edge projecting therefrom; a brush holderring having a cup shaped portion struck out centrally thereof, and provided with an inwardly extending flange the inner edge of which engages the inner edge of said ring, said brush holder ring being provided with diametrically opposed ears disposed in the plane of said flange, and provided with elongated slots, said ring being secured to said casing by means of bolts passing through said casing and the slots in said ears, said brush holder ring being provided with a plurality of openings therein, and an elongated curved slot; washers of insulating material secured to said -brush holder ring, on

each side thereof, and provided with openings and a slot corresponding to the openings and slot in said brush holder ring, but

of slightly smaller dimensions than said openings and said slot; brush holders fixed to said ring by bolts passing through said openings, and each comprising a bracket having a brush slidably mounted therein,

a spring engaging the outer end of said brush and carried by said bracket; and a third brush holder mounted on said ring by bolts passing through the curved slot in said ring.

2. In a device of the class described, the combination of a casing having an end wall and a cup struck out axially thereof; a ring disposed in said cup; a brush holder ring having a cup shaped portion struck out. axially thereof, and provided with an inwardly extending flange, engaging the inner edge of said first mentioned ring, said brush holder ring being adjustably secured to said casing, and being provided with aplurality of openings and a curved slot; washers secured to said ring on either side thereof and provided with openings and a slot of less dimensions than the openings and slot in said ring; brush holders fixed to said ring by bolts passing through said openings; and a brush holder adjustably secured to said rling by bolts passlng through said curved s 0t.

3. In a dynamo-electric machine, the com- 'bination of a casing; a brush holder ring,

adjustably secured to said casing and provided with an insulating washer on each side thereof; a brush holder secured to said ring and insulated therefrom by said washers; and a brush holder adjustably secured tosaid ring and insulated therefrom by said washers.

5. In a dynamo-electric machine, the combination of a casing; a brush holder Iing adjustably' secured to said casing; a brush holder fixed to said ring and insulated therefrom; a brush holder adjustably secured to said ring and insulated therefrom; and

means for adjusting said last named brush holder relative to said ring.

6. In a dynamo-electric machine, the combination of a casing; a brush holder ring se- 7 cured thereto and adjustable relative thereto, a plurality of brush holders carried by said ring and insulated therefrom; and means for adjusting one of said brush holders relative to the ring.

'1 In a device of the class described, the combination of a supporting member havingia plurality of openings therethrough, a sheet of insulating material disposed on said supporting member and having openings smaller than the openings in said supporting member and in line therewith, means for maintaining said supporting member and insulating material in fixed relation, and a supported member resting on said insulating material and secured to said supportin member by fastening means passing througi said alined'openings.

8. In a device of theclass described, the

combination of a casing having an end wall and a cup struck out axially thereof, a ring disposed in said cup, a brush holder ring having a cup-shaped portion struck out axially thereof and provided with an inwardly extending flange engaging the inner edge of said first named ring, said brush holder ring being provided with a plurality of openings and a curved slot, brush holders fixed to said ring by bolts passing through said openings, and a brush holder adjustably secured to said ring by bolts passing through said curved slot, and means for insulating said brush holders from each other.

9. In a dynamo electric machine, a brush holder ring, a ring of insulating material secured to said brush holder ring on each side thereof, said brush holder ring and said openings in the latter rings being materially ,smaller than those in the former ring, a brush holder, and means passing through said alined openings for securing said brush holder to said rings.

10. In a dynamo electric machine, a brush holder ring having a plurality of openings therethrough, a ring of insulating material secured to one side of said ring and provided with openings in line but appreciably smaller than the openings in said ring, a brush holder secured to said brush holder ring against said insulating ring, and means passing through said alin ng openings for binding said parts together, said means being insulated from the opposite side of said brush holder ring. 7

11. In a dynamo electric machine, a brush holder ring, a plurality of brush holders carried by said ring, an insulating ring lying between said brush holders and sald brush holder ring, said brush holder ring and said insulating ring having alining openings, the openings in the former being materially larger than those in the latter, securing means for said brush holders passing through said alinin openings and insulated insulating rings having alined openings, the

be rotatively adjusted relative to said ring.

13. In a dynamo electric machine having a commutator and cooperating brushes, the combination of an inclosing casing, a brush holder carrier plate, means for securing said carrier plate to said casing so as to permit a limited rotative movement thereof, a plurality of brush holders carried by said plate and means whereby one of said brush holders'may be rotatively moved on and relative to said carrier plate and about the commutator of the dynamo electric machine to vary the position of said one brush holder.

14. In a dynamo electric machine having a commutator, a casing having a substantially flat brush carrier engaging portion, a brush holder carrying plate, a plurality of brush holders carried by said plate and arranged about said commutator, means for securing said plate to the fiat portion of said casing, and means whereby one of said brush holders may be moved about said commutator independently of the other brush brush with said commutator.

15. In a dynamo electric machine a casing having an end wall,. a brush holder ring mounted adjacent said end Wall and substantially parallel thereto, means for securing said brush holder ring to said end Wall,

a pair of brush holders carried by said ring, a third brush holder also carried by said ring, and means for permitting a llmited angular movement of said third brush to holder about the center of said ring.

said casing, means for securing said ring in engagement with said end Wall a brush holder non'adjustably secured to said ring naraess and insulated therefrom, and a second brush holder insulated from and adjustably 'secured to said ring to permit limited angular movement thereof.

17. In a dynamo electric machine having a casing inclosing a rotatable member, a brush holder ring, means whereby said brush holder ring may have a limited rotative movement about the axis of rotation of said rotatable member a pair of brush hold- 'ers carried by said ring, a third. brush holder associated with said ring, and means whereby said third brush holder may be given a limited movement about said axis relative to said ring and be secured to said ring.

In testimon Whereofll afix m signature CL RENGJE F, GIL HRIST, 

